So, das ist ja bald mehr Maven- als Java-Code 
[code=XML]
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>${maven.dependency.plugin}</version>
<executions>
<!-- erstmal Abhängigkeiten für den Class-Path kopieren -->
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/modules</outputDirectory>
<excludeGroupIds>org.openjfx,com.fasterxml.jackson.core,com.fasterxml.jackson.dataformat</excludeGroupIds>
<includeScope>runtime</includeScope>
<artifactItems>
<artifactItem>
<groupId>${project.groupId}</groupId>
<artifactId>${project.artifactId}</artifactId>
<version>${project.version}</version>
<type>${project.packaging}</type>
</artifactItem>
</artifactItems>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>false</overWriteSnapshots>
<overWriteIfNewer>true</overWriteIfNewer>
</configuration>
</execution>
<!-- dazu noch das Projekt-JAR -->
<execution>
<id>copy</id>
<phase>install</phase>
<goals>
<goal>copy</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/modules</outputDirectory>
<artifactItems>
<artifactItem>
<groupId>${project.groupId}</groupId>
<artifactId>${project.artifactId}</artifactId>
<version>${project.version}</version>
<type>${project.packaging}</type>
<destFileName>${project.build.finalName}.jar</destFileName>
</artifactItem>
</artifactItems>
<overWriteIfNewer>true</overWriteIfNewer>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>com.github.akman</groupId>
<artifactId>jpackage-maven-plugin</artifactId>
<version>${jpackage.maven.plugin}</version>
<configuration>
<name>${app.name}</name>
<type>IMAGE</type>
<modulepath>
<dependencysets>
<dependencyset>
<includenames>
<includename>javafx\..*</includename>
</includenames>
</dependencyset>
</dependencysets>
</modulepath>
<addmodules>
<addmodule>java.sql</addmodule>
<addmodule>javafx.controls</addmodule>
<addmodule>javafx.fxml</addmodule>
</addmodules>
<mainclass>${main.class}</mainclass>
<input>${project.build.directory}/modules</input>
<mainjar>${jar.file}.jar</mainjar>
</configuration>
</plugin>
[/code]
Ist halt nicht besonders schön, dass man alles selbst angeben muss. Aber zumindest läuft das jetzt in Maven und nicht mehr via Batch.